The soft X-ray spectrum of NGC 4151

Details The soft X-ray spectrum of NGC 4151 The soft X-ray spectrum of NGC 4151

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..585p&link_type=abstract

(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews

Astronomy and Astrophysics

Astronomy

5

Astronomical Spectroscopy, Galactic Radiation, Seyfert Galaxies, X Ray Astronomy, Energy Spectra, Exosat Satellite, Flux Quantization, Photons, Spaceborne Astronomy

Scientific paper

Exosat observations of the Seyfert galaxy NGC 4151 over the period July 1983 to April 1984 have revealed a decreasing flux in the 2 to 10 keV band. In accord with previous measurements, a power law spectrum attenuated with a simple column of cold gas does not provide a satisfactory spectral fit below approximately 3 keV, where a lower relative opacity is required. Inclusion of additional low energy data from the Exosat telescopes allows the modeling of the absorbing column to be improved and reveals a second, separate, soft X-ray spectral component.

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